单项选择题
Which of the following uses a ring topology?（）
A.DSL
B.Ethernet
C.DOCSIS
D.SONET
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A user is unable to access the company website on a laptop. A network technician verifies that theuser can access other Internet pages. According to network troubleshooting methodology, which of the following steps should be taken NEXT?（）
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B. Ping the web server from inside the network to ensure it is still up and running.
C. Check to make sure the company's website is accessible from the Internet.
D. Ensure the Ethernet cable is securely plugged into the user's laptop -
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A. Baseline
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A. Verity full system functionality
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